AppDomain创建对象实例，dll在asp.net的bin就加载不成功求解！该如何解决

//创建新的Domain            domain = AppDomain.CreateDomain(name, null, AppDomain.CurrentDomain.BaseDirectory, "bin", true);//由于web一定会引用到这个DLL，所以这里直接写死到bin目录下            Type type = typeof(SmartPluginInstanceFactory);            //创建工厂实例化  [如果DLL在web的bin下就加载不了]            factory = (SmartPluginInstanceFactory)domain.CreateInstance(type.Assembly.FullName, type.FullName).Unwrap();            //factory = (SmartPluginInstanceFactory)domain.CreateInstanceFromAndUnwrap("这里是路径", type.FullName);